Wild New World Season 1 Episode 4 Edge of the Ice

At the end of the last Ice Age, the collapse of an ice dam in the New World triggered a rush of water that created a waterfall of epic proportions. New research suggests that the first people to arrive in America were hunters who travelled by boat, while the animal population of the time included such creatures as the elephant-like mastodon and its biggest predator, the scimitar-toothed cat.